Hi Toby,
Toby A Inkster wrote:
On 25 Jun 2009, at 21:18, Pat Hayes wrote:
If [RDF] requires people to tinker with files with names starting
with a dot [...] then the entire SWeb architecture is fundamentally
broken.
RDF doesn't. Apache does.
Many hosts do have front ends for configuring Apache, allowing
redirects to be set up and content-types configured by filling in
simple web forms. But there are such a variety of these tools with
different capabilities and different interfaces that it would be
difficult to produce advice suitable for them all, so instead
".htaccess" recipes are provided instead.
That said, there are a couple of steps that Martin could remove from
his recipe and still be promoting reasonably good practice:
Step 5a - this rewrites <http://example.org/semanticweb> to
<http://example.org/semanticweb.rdf>. Other than aesthetics, there's
no real reason to do this. Yes, I've read timbl's old Cool URIs
document, and understand about not wanting to include hints of file
format in a URI. But realistically, this file is going to always
include some RDF - perhaps in a non-RDF/XML serialisation, but I don't
see anything inappropriate about serving other RDF serialisations
using a ".rdf" URL, provided the correct MIME type is used.
Yes - while it breaks my heart, we will uses URIs including the .rdf
extension in the future. Comparing benefits and trouble caused, it is
not worth pushing it.
Step 5b - the default Apache mime.types file knows about
application/rdf+xml, so this should be unnecessary. Perhaps instead
have a GoodRelations "validator" which checks that the content type is
correct, and only suggests this when it is found to be otherwise.
Well, our experience is that about 30% of the servers don't use the
proper mime type by default, which causes trouble with many semweb
applications
Steps 3 and 4 could be amalgamated into a single "validate your RDF
file" step using the aforementioned validator. The validator would be
written so that, upon a successful validation, it offers single-click
options to ping semweb search engines, and Yahoo (via a
RDF/XML->DataRSS converter).
With those adjustments, the recipe would just be:
1. Upload your RDF file.
2. Add a rel="meta" link to it.
3. Validate using our helpful tool.
Yes, that would be a good option. But actually I am prone to go for a
more radical shift, which is offering just three alternative publication
mechanisms:
a) download RDF/XML or N3 file (for expert users)
b) download RDFa snippet that just represents the RDF/XML content (i.e.
such that it does not have to be consolidated with the "presentation
level" part of the Web page.
c) have us publish it on our servers (this will require some techniques
of validating users, update / refresh - requires some more thoughts.
Best
Martin
--
--------------------------------------------------------------
martin hepp
e-business & web science research group
universitaet der bundeswehr muenchen
e-mail: mh...@computer.org
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skype: mfhepp
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Check out the GoodRelations vocabulary for E-Commerce on the Web of Data!
========================================================================
Webcast:
http://www.heppnetz.de/projects/goodrelations/webcast/
Talk at the Semantic Technology Conference 2009:
"Semantic Web-based E-Commerce: The GoodRelations Ontology"
http://tinyurl.com/semtech-hepp
Tool for registering your business:
http://www.ebusiness-unibw.org/tools/goodrelations-annotator/
Overview article on Semantic Universe:
http://tinyurl.com/goodrelations-universe
Project page and resources for developers:
http://purl.org/goodrelations/
Tutorial materials:
Tutorial at ESWC 2009: The Web of Data for E-Commerce in One Day: A Hands-on
Introduction to the GoodRelations Ontology, RDFa, and Yahoo! SearchMonkey
http://www.ebusiness-unibw.org/wiki/GoodRelations_Tutorial_ESWC2009
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